FNUS75 KRIW 021551 FWSRIW SPOT FORECAST FOR ROCK CANYON...BLM RSD NATIONAL WEATHER SERVICE RIVERTON WY 951 AM MDT FRI SEP 2 2011 FORECAST IS BASED ON REQUEST TIME OF 0908 MDT ON SEPTEMBER 02. IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. ...RED FLAG WARNING IN EFFECT UNTIL 8 PM MDT THIS EVENING... .DISCUSSION... DRIER WEST TO SOUTHWEST FLOW WILL INCREASE THIS AFTERNOON ACROSS THE FIRE SITE. THIS WILL PRODUCE INCREASING WEST WIND AND RELATIVE HUMIDITIES DOWN AROUND 10 PERCENT. A RED FLAG WARNING IS IN EFFECT THROUGH 2000 HOURS FRIDAY. A COLD FRONT WILL PUSH THROUGH LATE TONIGHT WITH WIND BECOMING EAST-NORTHEAST BRINGING COOLER AIR BY SUNRISE SATURDAY. SATURDAY WILL BE COOLER AND DRY WITH DECREASED WIND AS HIGH PRESSURE SETTLES IN ACROSS WYOMING. ...THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS... ...HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT... FORECASTER...JONES .TODAY... SKY/WEATHER.........SUNNY. MAX TEMPERATURE.....AROUND 80. MIN HUMIDITY........8-11 PERCENT. 20 FOOT WINDS.......BECOMING WEST-SOUTHWEST 8 TO 12 MPH BETWEEN 1100 AND 1200. WEST WIND THEN INCREASING TO AROUND 20 MPH WITH GUSTS UP TO 35 MPH BY 1400. RIDGE TOP WINDS.....BECOMING WEST 20 TO 25 MPH BY 1300. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......INCREASING TO AROUND 10000 FT AGL BY 1400. TRANSPORT WINDS.....SOUTHWEST 15 TO 20 MPH SHIFTING TO THE WEST 20 TO 25 MPH BY 1400. SMOKE DISPERSAL.....POOR UNTIL 1100...THEN INCREASING TO EXCELLENT BY 1400. .TONIGHT... SKY/WEATHER.........CLEAR. MIN TEMPERATURE.....46-49. MAX HUMIDITY........44-47 PERCENT. 20 FOOT WINDS.......WEST-NORTHWEST WIND 16 TO 20 MPH WITH GUSTS AROUND 30 MPH UNTIL BETWEEN 1900 AND 2000... THEN DECREASING TO 7 TO 10 MPH. WIND BECOMING DOWNSLOPE/DOWNVALLEY 4 TO 7 MPH BY 2300. COLD FRONTAL PASSAGE BETWEEN 0200 AND 0400 BRINGS EAST-NORTHEAST WIND AROUND 10 MPH. RIDGE TOP WINDS.....WEST AROUND 20 MPH UNTIL 2000...THEN DECREASING TO AROUND 10 MPH BY MIDNIGHT. BECOMING EAST-NORTHEAST AROUND 12 MPH BETWEEN 0200 AND 0400. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......8000 FT AGL UNTIL 1900...THEN DECREASING TO LESS THAN 500 FT AGL BY MIDNIGHT. TRANSPORT WINDS.....WEST 20 TO 25 MPH UNTIL 2000...THEN DECREASING TO AROUND 15 MPH UNTIL 2300. THEN DOWNSLOPE/DOWNVALLEY 5 TO 10 MPH. SMOKE DISPERSAL.....VERY GOOD UNTIL 1900...THEN GRADUALLY DECREASING TO POOR BY 2300. .SATURDAY... SKY/WEATHER.........SUNNY. MAX TEMPERATURE.....71-74. MIN HUMIDITY........14-17 PERCENT. 20 FOOT WINDS.......EAST-NORTHEAST 5 TO 8 MPH UNTIL 1000... THEN GRADUALLY BECOMING UPSLOPE/UPVALLEY 5 TO 9 MPH BY 1200. RIDGE TOP WINDS.....EAST-NORTHEAST AROUND 10 MPH. LAL.................1. CHC OF WETTING RAIN.ZERO PERCENT. HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. MIXING HEIGHT.......LESS THAN 1000 FT AGL UNTIL 1000...THEN INCREASING TO AROUND 6000 FT AGL BY 1400. TRANSPORT WINDS.....DOWNSLOPE/DOWNVALLEY 9 TO 14 MPH. SMOKE DISPERSAL.....POOR UNTIL 1000...THEN GRADUALLY BECOMING GOOD BY 1400. .FORECAST DAYS 3 THROUGH 5... .SATURDAY NIGHT...CLEAR. LOWS IN THE UPPER 40S. WINDS GENERALLY LESS THAN 10 MPH. .SUNDAY...MOSTLY CLEAR. LOWS IN THE LOWER 50S. HIGHS IN THE UPPER 70S. WINDS GENERALLY LESS THAN 10 MPH. .LABOR DAY...PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE MID 50S. HIGHS AROUND 80. WINDS GENERALLY LESS THAN 10 MPH. .TUESDAY...PARTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE LOWER 50S. HIGHS IN THE UPPER 70S. WINDS GENERALLY LESS THAN 10 MPH. $$ FORECASTER...JONES REQUESTED BY...IC M COX REASON FOR REQUEST...WILDFIRE .TAG 20110902.ROCKC.01/RIW